Having a large or wide mouth; also used to mean speaking loudly, confidently, or without restraint.
Compound adjective formed from 'full-mouth' with the adjectival suffix '-ed,' suggesting someone possessing a 'full' (large) mouth, used since Middle English.
In older literature, 'full-mouthed' often suggested boldness or rudeness—which is fascinating because it shows how physical features were thought to reveal character traits.
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